Error message "gpg: Can't check signature: Broken public key"

Brian Minton brian at minton.name
Fri Dec 11 22:55:46 CET 2015


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

I got the following message:
rejected by import screener

Here's more detail (gpg 2.1.8 on Windows 8):

C:\Users\mintonb>gpg -vvv --recv 0x1712BC461AF778E4
gpg: using character set 'CP437'
gpg: data source: http://pgp.mit.edu:80
gpg: armor: BEGIN PGP PUBLIC KEY BLOCK
gpg: armor header: Version: SKS 1.1.5
gpg: armor header: Comment: Hostname: pgp.mit.edu
# off=0 ctb=99 tag=6 hlen=3 plen=269
:public key packet:
        version 4, algo 1, created 1415500876, expires 0
        pkey[0]: [2048 bits]
        pkey[1]: [17 bits]
        keyid: 251BCCEB547B7194
# off=272 ctb=b4 tag=13 hlen=2 plen=4
:user ID packet: "MFPA"
# off=278 ctb=89 tag=2 hlen=3 plen=322
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1415582356, md5len 0, sigclass 0x13
        digest algo 10, begin of digest 24 eb
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        hashed subpkt 2 len 4 (sig created 2014-11-10)
        hashed subpkt 25 len 1 (primary user ID)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2048 bits]
# off=603 ctb=89 tag=2 hlen=3 plen=322
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1441185092, md5len 0, sigclass 0x13
        digest algo 10, begin of digest f2 40
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        hashed subpkt 2 len 4 (sig created 2015-09-02)
        hashed subpkt 25 len 1 (primary user ID)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2042 bits]
# off=928 ctb=b4 tag=13 hlen=2 plen=18
:user ID packet: "0x251BCCEB547B7194"
# off=948 ctb=89 tag=2 hlen=3 plen=319
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1416188694, md5len 0, sigclass 0x13
        digest algo 10, begin of digest a3 61
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        hashed subpkt 2 len 4 (sig created 2014-11-17)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2048 bits]
# off=1270 ctb=89 tag=2 hlen=3 plen=319
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1441185086, md5len 0, sigclass 0x13
        digest algo 10, begin of digest 58 9d
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 2 len 4 (sig created 2015-09-02)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2045 bits]
# off=1592 ctb=89 tag=2 hlen=3 plen=319
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1416145056, md5len 0, sigclass 0x13
        digest algo 10, begin of digest 30 1c
        hashed subpkt 2 len 4 (sig created 2014-11-16)
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2044 bits]
# off=1914 ctb=b4 tag=13 hlen=2 plen=81
:user ID packet: "2014-667rhzu3dc-lists-groups at riseup.net <2014-667rhzu3dc-lists
- -groups at riseup.net>"
# off=1997 ctb=89 tag=2 hlen=3 plen=319
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1441159293, md5len 0, sigclass 0x13
        digest algo 10, begin of digest 96 2d
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        hashed subpkt 2 len 4 (sig created 2015-09-02)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2046 bits]
# off=2319 ctb=89 tag=2 hlen=3 plen=319
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1415582302, md5len 0, sigclass 0x13
        digest algo 10, begin of digest cd 16
        hashed subpkt 2 len 4 (sig created 2014-11-10)
        hashed subpkt 27 len 1 (key flags: 01)
        hashed subpkt 11 len 10 (pref-sym-algos: 13 9 8 12 7 3 11 10 4 2)
        hashed subpkt 21 len 6 (pref-hash-algos: 10 9 8 11 3 2)
        hashed subpkt 22 len 4 (pref-zip-algos: 3 2 1 0)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2047 bits]
# off=2641 ctb=b8 tag=14 hlen=2 plen=86
:public sub key packet:
        version 4, algo 18, created 1415574475, expires 0
        pkey[0]: [72 bits] nistp256 (1.2.840.10045.3.1.7)
        pkey[1]: [515 bits]
        pkey[2]: [32 bits]
        keyid: 6ACDDA063F6FC8DE
# off=2729 ctb=89 tag=2 hlen=3 plen=287
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1415574475, md5len 0, sigclass 0x18
        digest algo 10, begin of digest f8 e2
        hashed subpkt 2 len 4 (sig created 2014-11-09)
        hashed subpkt 27 len 1 (key flags: 0C)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2047 bits]
# off=3019 ctb=89 tag=2 hlen=3 plen=287
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1421371951, md5len 0, sigclass 0x28
        digest algo 10, begin of digest 64 f3
        hashed subpkt 2 len 4 (sig created 2015-01-16)
        hashed subpkt 29 len 1 (revocation reason 0x03 ())
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2045 bits]
# off=3309 ctb=b8 tag=14 hlen=2 plen=87
:public sub key packet:
        version 4, algo 18, created 1417809993, expires 0
        pkey[0]: [80 bits] brainpoolP256r1 (1.3.36.3.3.2.8.1.1.7)
        pkey[1]: [515 bits]
        pkey[2]: [32 bits]
        keyid: 4793107F2C53A3B6
# off=3398 ctb=89 tag=2 hlen=3 plen=287
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1417809993, md5len 0, sigclass 0x18
        digest algo 10, begin of digest 8c 6d
        hashed subpkt 2 len 4 (sig created 2014-12-05)
        hashed subpkt 27 len 1 (key flags: 0C)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2045 bits]
# off=3688 ctb=b9 tag=14 hlen=3 plen=269
:public sub key packet:
        version 4, algo 1, created 1415502447, expires 0
        pkey[0]: [2048 bits]
        pkey[1]: [17 bits]
        keyid: 6B7C74CEB31F25F0
# off=3960 ctb=89 tag=2 hlen=3 plen=670
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1415502447, md5len 0, sigclass 0x18
        digest algo 10, begin of digest fa 7d
        hashed subpkt 2 len 4 (sig created 2014-11-09)
        hashed subpkt 27 len 1 (key flags: 02)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        subpkt 32 len 380 (signature: v4, class 0x19, algo 1, digest algo 10)
        data: [2046 bits]
# off=4633 ctb=b9 tag=14 hlen=3 plen=269
:public sub key packet:
        version 4, algo 1, created 1415502602, expires 0
        pkey[0]: [2048 bits]
        pkey[1]: [17 bits]
        keyid: 8D69E0E6BAE157F8
# off=4905 ctb=89 tag=2 hlen=3 plen=287
:signature packet: algo 1, keyid 251BCCEB547B7194
        version 4, created 1415502602, md5len 0, sigclass 0x18
        digest algo 10, begin of digest 6e e7
        hashed subpkt 2 len 4 (sig created 2014-11-09)
        hashed subpkt 27 len 1 (key flags: 0C)
        subpkt 16 len 8 (issuer key ID 251BCCEB547B7194)
        data: [2048 bits]
gpg: pub  rsa2048/251BCCEB547B7194 2014-11-09  MFPA
gpg: key 251BCCEB547B7194: rejected by import screener
gpg: Total number processed: 1

C:\Users\mintonb>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2

iF4EAREIAAYFAlZrRbcACgkQa46zoGXPuqnBjAD6A4EWvTcfWVK1mpfN+zWDRARe
myNNWmjDUAsYqaqn9IAA/iBHS/7vUJtBJgMCxbT69VRYZ/qkvjqGlb3Ti48aGbId
=JhPl
-----END PGP SIGNATURE-----



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