为什么GnuPG解密速度这么低

Question

解密速度是加密的20倍！结果显示加密时间为14.238579760014545（1000次），解密时间为339.19246241397923（1000次）。
CPU：英特尔® 酷睿™ i7-4790 CPU @ 3.60GHz × 8 内存：15.6 GiB OS : Ubuntu 18

    import timeit

    mysetup = '''
    import gnupg

    '''
    encrypt_code = '''
    gpg = gnupg.GPG(gnupghome='gpghome')
    text="""Or kind rest bred with am shed then. In raptures building an bringing be. Elderly is detract tedious assured private so to visited. Do travelling companions contrasted it. Mistress strongly remember up to. Ham him compass you proceed calling detract. Better of always missed we person mr. September smallness northward situation few her certainty something. 

    An sincerity so extremity he additions. Her yet there truth merit. Mrs all projecting favourable now unpleasing. Son law garden chatty temper. Oh children provided to mr elegance marriage strongly. Off can admiration prosperous now devonshire diminution law. """
    status = gpg.encrypt(text, recipients=['testgpguser@mydomain.com'])
    '''

    decrypt_code = '''
    gpg = gnupg.GPG(gnupghome='gpghome')
    enc_text=b"-----BEGIN PGP MESSAGE-----\n\nhQEMA0GPN4kKbscAAQf/RNDIh8LqxJi572Kd330Fx0DmYVMBnLy8Bcn0z4vZNpIM\njkXdnH3aqOGD+/2ToIGhgGZue46ZDc/J2pdTze1wJsP20E1q04v/J3lihRa368cc\nYfD4Za0egt7mY1LeW7ABXzqQ3Ni1hLP97wOHe1WSfM7csOXv4xfIREM2e6IOvJ4C\nwIrgReQbHNbEtLw3NxINevj8YVPuILJp6IDcbDtieLexTS2y66j7GazSDZRZgHLi\nu4qE8P4Oq6sf1f0YSQI4oeQrtVKEfIIFyb/SNag1FrqRLjF3TGM22OUIIoCleYdN\nzyv1tEeulU9h1+QYogSa7BxYB9pmW6keA8d/QdkG09I7AXXVdGL9mq0cLVqReXyC\nqCDvnejwcM8E5ceHZR8KGm+9jVB+hcxC2HJ3TABnFNUeHMknVvLoFP9xMe0=\n=KSv4\n-----END PGP MESSAGE-----\n"
    status = gpg.decrypt(enc_text, passphrase='my passphrase')
    '''


    print(timeit.timeit(setup=mysetup, stmt=encrypt_code, number=1000))
    print(timeit.timeit(setup=mysetup, stmt=decrypt_code, number=1000))

Answer 1

GPG使用RSA，根据this answerRSA解密比加密慢是完全正常的，因为私钥需要很长，但是public密钥不需要必然。

Answer 2

请注意，您的解密需要密码而不是加密。这是因为私钥位于加密的密钥环中。这个passphrase使用的密钥偏差过程妥妥的是一个迭代过程，需要一些时间。

可能是这个：iterated-and-salted-s2k

为什么GnuPG解密速度这么低

Why GnuPG decryption speed is so low

python

encryption

gnupg